I test rode a custom painted base version ($6999 before tax) yesterday and I felt it got along pretty great.
I'm a clydesdale rider (6'4", 245 pounds) and while it wasn't even close to my size, I was impressed by its ability to move me quickly right up to the limit over flat ground. I was able to get up in the big ring and run between the top 2 cogs easily. I would normally be riding the small ring this time of year on an analog bike, so this felt awesome! The slight hills here were not an issue as long as you were sensitive to the being in the right gear, with plenty of assistance in both river, and rocket mode. It was very smooth both in activation and top out, with no surges or jerks. I could barely hear the motor at all, even in the top or "rocket" mode.
I do think I could do a group ride with this motor. I verified it topping out at (slightly above) 20 mph, but that seemed completely adequate, or maybe even too fast for the NYC/Manhattan streets & bike paths, but maybe I'd feel different outside of this area.
The bike itself was very nicely built, and I was truly impressed by Trek's cable management, and overall fit and finish. Very slick. It had no rattles, and I really like Trek's iso-speed seat post. The base level Domane+ LT is a much better deal than the 7 or 9. It is equipped with Full Ultegra (not Di2, but shifts very nicely anyway) and DT Swiss alloy wheels with straight pull hubs/spokes.
I don't know that I'd spend my money for dura-ace on any e-bike, maybe carbon wheels though. I think the achilles heal for this one might be the battery size/efficiency.
I haven't ridden Ebikemotion yet, anybody have any comparison experience of the USA class 1 version?
I still need to try the Creo, but this one might be in the hunt.